Pyros are really, really terrible units when it comes to lower or higher levels. They are best used behind a Sentinel. Because they are easily killed, they make great baits for towers to make Pulse Tanks turn to beast mode. Be careful in placing the squad of Sentinels/Pyros because a Tesla Tower or an X-1 Cannon can take out a Pyro in one hit. This unit can be won by completing the level 6 Barracks mission, which never needs to be completed due to new Fleet Academy building requirements.

Strengths:

Decent damage

Good warp size

Embarassing for the defender

Usefull if high leveled

Weaknesses:

Bad health (least of any troop)

Rate of fire makes them practically incapable of firing a single shot in most settings